/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.ops4j.pax.web.introspection;

import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ErrorServlet extends IntrospectionServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setContentType("text/plain");

		// Servlets 3.1 spec, 10.9.1 "Request Attributes"
		Integer statusCode = (Integer) req.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
		Class<?> exceptionType = (Class<?>) req.getAttribute(RequestDispatcher.ERROR_EXCEPTION_TYPE);
		String message = (String) req.getAttribute(RequestDispatcher.ERROR_MESSAGE);
		Throwable exception = (Throwable) req.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
		String requestUri = (String) req.getAttribute(RequestDispatcher.ERROR_REQUEST_URI);
		String servletName = (String) req.getAttribute(RequestDispatcher.ERROR_SERVLET_NAME);

		resp.getWriter().println(String.format("%d|%s|%s|%s|%s|%s",
				statusCode == null ? 0 : statusCode,
				exceptionType == null ? "null" : exceptionType.getName(),
				message,
				exception == null ? "null" : exception.getClass().getName(),
				requestUri,
				servletName));
	}

}
